Question

genetic therapy and engineering ______. a. have no value for our future b. have been used for many years to prevent genetic diseases c. are simple procedures that most doctors can perform d. are controversial scientific procedures please select the best answer from the choices provided.

Explanation:

• Option A: Genetic therapy and engineering have potential value for future medical advancements (e.g., treating genetic disorders), so this is incorrect.
• Option B: While they are used for genetic disease - related work, they haven't been used for "many years" in a widespread, long - term preventive way as the field is relatively new and still developing.
• Option C: Genetic therapy and engineering are complex procedures requiring specialized knowledge and equipment, not something most doctors can perform.
• Option D: Genetic therapy and engineering are controversial. There are ethical, safety, and social concerns (e.g., issues about gene - editing in humans, potential for unintended consequences) surrounding these procedures.

Answer:

D. are controversial scientific procedures